KVM 虚拟机调整 qcow2 格式硬盘大小 |
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需求 kvm114 虚拟机 根分区需要扩展 5G 大小 2种解决方案 1、通过 resize 命令扩展境像大小，然后进入虚拟机分区， 再创建物理卷，加入卷组，扩展逻辑卷 2、通过 create 命令 创建一块新的 qcow2 磁盘，并加入虚拟机配置里面，然后进入虚拟机分区， 再创建物理卷，加入卷组，扩展逻辑卷 第一种方案1、查看 kvm114 虚拟机的大小是 10G [root@vm71 vms]# qemu-img info /home/vms/kvm114.qcow2 # 显示 image: kvm114.qcow2 file format: qcow2 virtual size: 10G (10737418240 bytes) disk size: 1.3G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true2、关闭虚拟机 [root@vm71 vms]# virsh shutdown kvm1143、通过 resize 调整大小 [root@vm71 vms]# qemu-img resize kvm114.qcow2 +5G # 显示 Image resized. # 查看 qemu-img info kvm114.qcow2 # 结果已扩大至 15G image: kvm114.qcow2 file format: qcow2 virtual size: 15G (16106127360 bytes) disk size: 1.3G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true4、启动虚拟机 [root@vm71 vms]# virsh start kvm1145、查看虚拟机硬盘使用空间 # 发现增加的 5G 没有显示 [root@kvm114 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/cl-root 8.0G 1.1G 7.0G 13% / devtmpfs 486M 0 486M 0% /dev tmpfs 497M 0 497M 0% /dev/shm tmpfs 497M 6.5M 490M 2% /run tmpfs 497M 0 497M 0% /sys/fs/cgroup /dev/vda1 1014M 138M 877M 14% /boot tmpfs 100M 0 100M 0% /run/user/0６、查看分区 [root@kvm114 ~]# fdisk -l # /dev/vda 硬盘已扩大了 Disk /dev/vda: 16.1 GB, 16106127360 bytes, 31457280 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x000b41fc Device Boot Start End Blocks Id System /dev/vda1 * 2048 2099199 1048576 83 Linux /dev/vda2 2099200 20971519 9436160 8e Linux LVM Disk /dev/mapper/cl-root: 8585 MB, 8585740288 bytes, 16769024 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/cl-swap: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes7、对新加的空间分区 [root@kvm114 ~]# fdisk /dev/vda Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. # 输入 p 查看分区 Command (m for help): p Disk /dev/vda: 16.1 GB, 16106127360 bytes, 31457280 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x000b41fc Device Boot Start End Blocks Id System /dev/vda1 * 2048 2099199 1048576 83 Linux /dev/vda2 2099200 20971519 9436160 8e Linux LVM # 输入 n 创建一个分区 Command (m for help): n Partition type: p primary (2 primary, 0 extended, 2 free) e extended # 输入 p 选择主分区 Select (default p): p # 输入分区号，默认回车 Partition number (3,4, default 3): 3 # 输入 起始扇区，默认回车 First sector (20971520-31457279, default 20971520): Using default value 20971520 # 输入 结尾扇区，默认回车 Last sector, +sectors or +size{K,M,G} (20971520-31457279, default 31457279): Using default value 31457279 Partition 3 of type Linux and of size 5 GiB is set # 调整分区格式 Command (m for help): t # 选择哪个分区，默认回车 Partition number (1-3, default 3): 3 # 输入 8e,为lvm分区 Hex code (type L to list all codes): 8e Changed type of partition 'Linux' to 'Linux LVM' # 保存 Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks.８、查看分区 # 重载分区表 [root@kvm114 ~]# partprobe # 查看分区 [root@kvm114 ~]# fdisk -l # 新加的 vda3 分区已显示 Disk /dev/vda: 16.1 GB, 16106127360 bytes, 31457280 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x000b41fc Device Boot Start End Blocks Id System /dev/vda1 * 2048 2099199 1048576 83 Linux /dev/vda2 2099200 20971519 9436160 8e Linux LVM /dev/vda3 20971520 31457279 5242880 8e Linux LVM Disk /dev/mapper/cl-root: 8585 MB, 8585740288 bytes, 16769024 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/cl-swap: 1073 MB, 1073741824 bytes, 2097152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes9、创建物理卷，加入卷组，扩展逻辑卷 # 将物理分区初始化为物理卷,以便LVM使用 [root@kvm114 ~]# pvcreate /dev/vda3 Physical volume "/dev/vda3" successfully created. # 查看物理卷 [root@kvm114 ~]# pvs PV VG Fmt Attr PSize PFree /dev/vda2 cl lvm2 a-- 9.00g 0 /dev/vda3 lvm2 --- 5.00g 5.00g # 把 vda3 加入卷组 [root@kvm114 ~]# vgextend cl /dev/vda3 Volume group "cl" successfully extended # 查看 卷组大小，显示可用为 5G [root@kvm114 ~]# vgs VG #PV #LV #SN Attr VSize VFree cl 2 2 0 wz--n- 13.99g 5.00g # 扩展 cl-root 逻辑卷 [root@kvm114 ~]# lvextend -l +100%FREE /dev/mapper/cl-root Size of logical volume cl/root changed ...to 12.99 GiB (3326 extents). Logical volume cl/root successfully resized. # 同步文件系统 [root@kvm114 ~]# xfs_growfs /dev/mapper/cl-root10、查看分区使用情况 # cl-root 已由 8G 扩大至 13G [root@kvm114 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/cl-root 13G 1.1G 12G 8% / devtmpfs 486M 0 486M 0% /dev tmpfs 497M 0 497M 0% /dev/shm tmpfs 497M 6.6M 490M 2% /run tmpfs 497M 0 497M 0% /sys/fs/cgroup /dev/vda1 1014M 138M 877M 14% /boot tmpfs 100M 0 100M 0% /run/user/0 第二种方案１、创建镜像 # 创建一个新的境像 [root@vm71 vms]# qemu-img create -f qcow2 kvm114_add.qcow2 5G # 查看镜像文件 [root@vm71 vms]# ll -rw-r--r--. 1 root root 197120 3月 24 11:10 kvm114_add.qcow2 -rw-------. 1 qemu qemu 10739777536 3月 24 11:09 kvm114.qcow22、编辑 kvm114 配置文件 # 关闭虚拟机 [root@vm71 vms]# virsh shutdown kvm114 # 编辑配置文件 [root@vm71 vms]# virsh edit kvm114 # 新增3、进入虚拟机 分区 [root@kvm114 ~]# fdisk /dev/vdb # 具体过程见上面4、创建物理卷，加入卷组，扩展逻辑卷 # 创建物理卷 [root@kvm114 ~]# pvcreate /dev/vdb1 # 具体过程见上面
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